作者: Bramlage, Birgit ; Kesavan, Venkitasamy ; John, Matthias ; Hadwiger, Philipp ; Racie, Timothy ; Roehl, Ingo ; Elbashir, Sayda ; Pandey, Rajendra K. ; Koteliansky, Victor ; Akinc, Akin ; Harborth, Jens ; Vornlocher, Hans-Peter ; Wuschko, Silvio ; Bumcrot, David ; Geick, Anke ; Manoharan, Muthiah ; Charisse, Klaus ; Rajeev, Kallanthottathil G. ; Soutschek, Juergen ; Limmer, Stefan ; Toudjarska, Ivanka ; Wang, Gang ; Constien, Rainer ; Lavine, Gary ; Donoghue, Mary
RNA interference (RNAi) holds considerable promise as a therapeutic approach to silence disease-causing genes, particularly those that encode so-called ′non-druggable′ targets that are not amenable to conventional therapeutics such as small mols., proteins, or monoclonal antibodies.The main obstacle to achieving in vivo gene silencing by RNAi technologies is delivery.Here we show that chem. modified short interfering RNAs (siRNAs) can silence an endogenous gene encoding apolipoprotein B (apoB) after i.v. injection in mice.Administration of chem. modified siRNAs resulted in silencing of the apoB mRNA in liver and jejunum, decreased plasma levels of apoB protein, and reduced total cholesterol.We also show that these siRNAs can silence human apoB in a transgenic mouse model.In our in vivo study, the mechanism of action for the siRNAs was proven to occur through RNAi-mediated mRNA degradation, and we determined that cleavage of the apoB mRNA occurred specifically at the predicted site.These findings demonstrate the therapeutic potential of siRNAs for the treatment of disease.